The Micro-Light Flashing Armband is the perfect partner for your runs!!  It has strobe illumination; it is reflective, AND it’s flourescent for both day and night visibility!  It’s a TWO-FER!!  Tip:  it fits sizes up to 18″ so for those of you with dogs, it works great as a collar!!!  I swear, it’s the only way I can find my dog in my backyard at night…  Includes ultrabright flashing LEDs and full reflectivity from end-to-end.  It has 4 ultrabright LEDs for 360 degree visibility.  Easy on and off. The battery is included and you’re ready to go!  And you can get the replacement at your local drugstore